COLONIE — A Schenectady man faces various charges, including driving while impaired by drugs, after police say he crashed into an officer's vehicle Saturday.

Colonie police say a sergeant watched a gray 2008 Cadillac speeding east on Central Avenue near Jupiter Lane around 4 p.m. and proceeded to activate his emergency lights.

The driver of Cadillac, who police say is 28-year-old Tommy J. Ehlers, accelerated and struck another Colonie police vehicle near Dott Avenue. The officer driving, who police did not identify, sustained minor injuries and was treated and released from Albany Medical Center Hospital.

The accident closed part of Central Avenue Rooney and Frederick avenues from late afternoon until early evening Saturday.

After the crash Ehlers, who refused medical treatment, was taken into custody and charged with second-degree assault, reckless endangerment, driving while ability impaired by drugs, and other driving infractions.

Anthony Colagiovanni, who owns Headliner's Barbershop on Central near Rooney, said he was inside during the crash but saw a wheel roll by his window and went out to take a look.

"When I came out, he was in the car, and three officers had their guns drawn on him," he said. "They let him out, and he got out, had his hands up, got down on the ground and surrendered."

Police are continuing to investigate the accident and are asking for any witnesses to contact the Colonie Police Traffic Safety Unit at (518) 783-2744.